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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year $ 125 $ 132 $ 120
Additions (Deductions) charged to costs and expenses 77 31 32
Charge off's and other (43) (38) (20)
Balance end of year 159 125 132
Allowance for Excess and Obsolete Inventories [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 370 396 338
Additions (Deductions) charged to costs and expenses 186 128 89
Charge off's and other (56) (154) (31)
Balance end of year 500 370 396
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 48 133 93
Additions (Deductions) charged to costs and expenses 15 (83) 40
Charge off's and other   (2)  
Balance end of year 63 48 133
Warranty Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 272 228 194
Additions (Deductions) charged to costs and expenses 92 123 101
Charge off's and other (120) (79) (67)
Balance end of year $ 244 $ 272 $ 228